The vagus nerve has become a popular topic in conversations about stress, digestion, inflammation, mental health, and the nervous system. Social media is filled with advice about how to “reset,” “tone,” or “stimulate” your vagus nerve—but the science is more nuanced and, in many ways, far more interesting.

Vagus nerve health is closely connected to the broader function of the autonomic nervous system—the network that continuously helps regulate heart rate, breathing, digestion, and many other processes that occur without conscious effort.

Understanding what the vagus nerve actually does can help separate established physiology from some of the exaggerated claims surrounding it.

What Is the Vagus Nerve?

The vagus nerve, also known as cranial nerve X, is the longest and most widely distributed cranial nerve.

The word vagus comes from the Latin word for “wandering,” an appropriate name for a nerve that travels from the brainstem through the neck and into the chest and abdomen.

Along its extensive pathway, it communicates with structures involved in the function of the:

• Heart
• Lungs
• Esophagus
• Stomach
• Intestines
• Liver and other abdominal organs

Importantly, the vagus nerve is not simply a one-way command system from the brain to the body.

A large proportion of its fibers carry sensory information from the body toward the brain, helping the central nervous system continuously monitor what is happening internally.

This bidirectional communication makes the vagus nerve an important part of the connection between the brain and body.

Why Vagus Nerve Health Matters

The vagus nerve is a major component of the parasympathetic nervous system.

The parasympathetic system is often described as the body’s “rest and digest” system, although its functions are considerably more complex than this simple description suggests.

Vagal pathways participate in regulating:

• Heart rate
• Digestion and gastrointestinal motility
• Breathing-related cardiovascular changes
• Swallowing and vocal function
• Communication between the gut and brain
• Neuroimmune signaling
• Recovery following physiological stress

Rather than thinking of the vagus nerve as an on/off switch that needs to be “activated,” it is more accurate to think of it as part of a constantly adapting regulatory network.

The Vagus Nerve and the Stress Response

When we encounter a perceived threat or significant demand, the autonomic nervous system helps coordinate the physiological response.

Heart rate may increase. Breathing patterns change. Blood flow and energy resources are redirected according to the body’s immediate needs.

Once the challenge has passed, parasympathetic processes participate in helping the body transition toward recovery.

The vagus nerve is an important part of this regulation, particularly through its influence on cardiovascular, respiratory, and digestive function.

This is one reason practices such as slow breathing, adequate sleep, physical activity, relaxation, and meaningful social connection may influence how we experience and recover from stress.

These practices do not literally “reset” the vagus nerve. Rather, they may support healthier regulation of the autonomic nervous system as a whole.

Vagus Nerve Health and Inflammation

One of the most fascinating areas of vagus nerve research involves communication between the nervous and immune systems.

Researchers have identified neural pathways involved in regulating inflammatory signaling, including mechanisms commonly described as the inflammatory reflex and cholinergic anti-inflammatory pathway.

Experimental and clinical research suggests that vagal signaling and therapeutic vagus nerve stimulation can influence aspects of immune activity and inflammatory signaling.

However, this does not mean that simply “increasing vagal tone” will prevent or treat inflammatory or autoimmune disease.

The neuroimmune system is highly complex, and research into therapeutic neuromodulation is very different from claims that everyday lifestyle techniques directly suppress specific inflammatory cytokines.

Recent research continues to investigate vagus nerve stimulation as a potential therapeutic approach for inflammatory and other chronic conditions, but clinical applications remain condition-specific and continue to evolve.

The Vagus Nerve and the Gut-Brain Connection

One of the most important areas of vagus nerve health is its relationship with digestion.

The gastrointestinal tract and brain communicate continuously through multiple pathways collectively known as the gut-brain axis.

The vagus nerve is one important part of this communication network.

It carries sensory information from the gastrointestinal tract toward the brain and participates in regulating aspects of:

• Gastric function
• Gastrointestinal motility
• Satiety signaling
• Digestive secretions
• Gut-brain communication

This connection helps explain why stress and emotional states can influence digestive symptoms—and why gastrointestinal signals can, in turn, influence how we feel.

Research is also exploring therapeutic vagus nerve stimulation for gastrointestinal disorders. A 2025 systematic review found promising results for non-invasive vagus nerve stimulation across several gastrointestinal conditions, while also highlighting the relatively small and heterogeneous evidence base.

Internal link opportunity: This is an excellent place to link to your Understanding Gastroparesis: When the Stomach Slows Down article.

You could write:

The vagus nerve also plays an important role in gastric function and motility. If you would like to explore what happens when stomach emptying becomes abnormally slow, read Understanding Gastroparesis: When the Stomach Slows Down.

Can You Measure Vagal Tone?

This is an area where terminology can become confusing.

Heart rate variability (HRV) is often discussed as though it directly measures the health or “strength” of the vagus nerve.

It does not.

HRV measures variation in the timing between heartbeats. Certain HRV measurements, particularly under controlled conditions, can provide useful information about cardiac autonomic regulation and parasympathetic influences on the heart.

However, HRV is influenced by many factors, including:

• Breathing
• Age
• Fitness
• Sleep
• Physical activity
• Illness
• Medications
• Alcohol
• Stress
• Measurement conditions

Therefore, a single HRV number should not be interpreted as a direct measurement of overall vagus nerve function.

What About Oura, WHOOP, and Other Wearables?

Consumer wearables can be useful for observing personal trends in HRV over time, particularly when measurements are taken consistently under similar conditions.

For example, changes in your usual HRV pattern may occur alongside changes in sleep, training load, illness, alcohol consumption, or stress.

The most useful comparison is generally you versus your own baseline, rather than comparing your HRV number with someone else’s.

Wearable HRV should be viewed as one piece of physiological information—not a diagnostic test of vagus nerve health or disease.

Can You Stimulate Your Vagus Nerve Naturally?

This is perhaps where the most misinformation exists.

You may have seen claims that humming, singing, gargling, cold showers, specific foods, or breathing exercises directly “stimulate” or “reset” the vagus nerve.

The reality is more nuanced.

Some everyday practices can influence breathing, heart rate, stress perception, or autonomic regulation. That does not necessarily mean they are directly stimulating the vagus nerve in the same way as a medical vagus nerve stimulation device.

Slow Diaphragmatic Breathing

Slow, controlled breathing is one of the better-supported approaches for influencing autonomic physiology.

Breathing—particularly slower breathing with a comfortable, controlled exhalation—can influence heart rate variability and cardiorespiratory regulation and may help promote relaxation.

You do not need to force extremely slow breathing or perform complicated techniques.

A comfortable, sustainable breathing practice is generally more useful than trying to achieve a specific “vagal” number.

Singing, Humming, and Chanting

Singing, humming, and chanting involve controlled breathing, vocalization, and often prolonged exhalation.

Many people find these activities calming.

While the vagus nerve is involved in structures associated with the throat and voice, there is insufficient evidence to claim that ordinary humming directly “tones” or meaningfully strengthens the vagus nerve.

If humming or singing helps you relax, enjoy it—but you do not need to think of it as a vagus nerve workout.

Cold Exposure

Cold water applied to the face can trigger physiological reflexes that affect heart rate and autonomic activity.

However, this is different from saying that taking cold showers “resets” or strengthens the vagus nerve.

Cold exposure is not necessary for good vagus nerve health, and it may not be appropriate for everyone, particularly people with certain cardiovascular or medical conditions.

Social Connection

Positive social relationships are strongly associated with physical and emotional well-being.

Feeling safe, supported, and connected may influence stress physiology and autonomic regulation through multiple interacting biological and psychological pathways.

Rather than saying that social connection directly “activates the vagus nerve,” it is more accurate to recognize that healthy relationships are part of a broader environment that supports nervous system regulation and resilience.

Laughter and Enjoyable Activities

Laughter, humor, enjoyable activities, and positive social experiences may reduce perceived stress and promote relaxation.

Again, the benefit is broader than simply “stimulating the vagus nerve.”

Sometimes the simplest practices—laughing with friends, walking outdoors, sharing a meal, or spending time doing something you genuinely enjoy—can create conditions that allow the nervous system to shift away from sustained stress.

Diet and the Gut-Brain Axis

A nutritious, varied diet supports gastrointestinal and overall health.

Fiber-rich plant foods and fermented foods can influence the gut microbiome, which participates in complex communication with the nervous, endocrine, metabolic, and immune systems.

The vagus nerve is one pathway involved in gut-brain communication, but eating yogurt or sauerkraut should not be described as directly “stimulating” the vagus nerve.

The relationship between diet, the microbiome, and the brain is much more complex—and much more interesting—than that.

What About Polyvagal Theory?

Polyvagal Theory has become widely used in discussions about trauma, emotional regulation, social connection, and feelings of safety.

Developed by Stephen Porges, the theory proposes a framework linking autonomic states with defensive responses and social engagement.

Concepts such as co-regulation, perceived safety, and the relationship between physiological state and behavior have been influential in psychotherapy and mind-body approaches.

However, it is important to distinguish a useful clinical framework from established neuroanatomical fact.

Some of Polyvagal Theory’s specific evolutionary, anatomical, and physiological claims remain scientifically debated. Recent publications continue both to defend and substantially critique its underlying assumptions.

For this reason, I prefer to discuss social connection, safety, and nervous system regulation using the broader and well-established science of the autonomic nervous system, while recognizing Polyvagal Theory as one proposed interpretive framework.

Medical Vagus Nerve Stimulation Is Different

It is important to distinguish lifestyle practices from vagus nerve stimulation (VNS) used in medicine and research.

Medical VNS delivers controlled electrical stimulation to vagal pathways.

Implantable Vagus Nerve Stimulation

Implanted VNS devices electrically stimulate the cervical vagus nerve according to programmed parameters.

VNS has established medical uses, including treatment of certain forms of:

• Drug-resistant epilepsy
• Treatment-resistant depression

Other applications continue to be studied.

These devices are fundamentally different from breathing exercises, humming, cold showers, or other wellness practices commonly described online as “vagus nerve stimulation.”

Transcutaneous Auricular Vagus Nerve Stimulation

Transcutaneous auricular vagus nerve stimulation (taVNS) is a non-invasive neuromodulation technique that delivers controlled electrical stimulation to regions of the external ear innervated in part by the auricular branch of the vagus nerve.

This is an active and promising area of research.

Studies have investigated taVNS for conditions including:

• Depression
• Functional gastrointestinal disorders
• Pain
• Sleep disorders
• Inflammatory conditions
• Autonomic regulation

A 2023 systematic review and meta-analysis found promising evidence for taVNS in depressive disorders, while more recent research continues to examine its clinical applications and optimal stimulation protocols.

A 2025 systematic review and meta-analysis also reported encouraging findings for functional dyspepsia, although additional high-quality research is still needed to establish optimal protocols and clarify which patients are most likely to benefit.

Auricular Acupuncture and the Vagus Nerve

This area is particularly interesting to me because my doctoral research explored auricular acupuncture and vagal neuromodulation.

Parts of the external ear receive sensory innervation from several nerves, including the auricular branch of the vagus nerve.

This anatomy has led researchers to investigate whether stimulation of specific auricular regions—through electrical stimulation, acupuncture, or related techniques—may influence autonomic or neuroimmune pathways.

However, auricular acupuncture and taVNS should not automatically be treated as interchangeable.

taVNS uses controlled electrical parameters designed specifically to stimulate targeted auricular regions. Acupuncture involves a different type of sensory stimulation, and its mechanisms may involve multiple peripheral and central pathways.

Research into auricular stimulation and inflammatory markers is developing, but findings should be interpreted within the limitations and heterogeneity of the available studies. A 2025 systematic review and meta-analysis examined these effects across randomized trials, reflecting growing scientific interest in this area.

Supporting Vagus Nerve Health in Everyday Life

Rather than trying to “hack,” “reset,” or constantly stimulate your vagus nerve, I prefer a broader approach to vagus nerve health and autonomic regulation.

Consider the fundamentals:

• Breathe slowly and comfortably when you feel stressed.
• Move your body regularly.
• Prioritize restorative sleep.
• Spend time outdoors.
• Maintain meaningful social connections.
• Eat a varied, nutrient-dense diet that supports overall and gastrointestinal health.
• Make room for laughter and activities you genuinely enjoy.
• Seek appropriate support when chronic stress, anxiety, pain, or illness is overwhelming your ability to recover.

None of these practices needs to be framed as a vagus nerve “hack.”

They are simply part of supporting the complex biological systems that help us adapt, regulate, recover, and remain resilient.

The Future of Vagus Nerve Research

The future of vagus nerve research is particularly exciting in the field of bioelectronic medicine.

Researchers are investigating whether precisely targeted neuromodulation could influence specific neural circuits involved in inflammation, gastrointestinal function, pain, mood, and other physiological processes.

Areas of active investigation include:

• Non-invasive vagus nerve stimulation
• Neuroimmune regulation
• Gastrointestinal disorders
• Inflammatory conditions
• Mood disorders
• Pain
• Sleep
• Personalized stimulation protocols

The key distinction is that these are areas of scientific investigation, not established evidence that increasing “vagal tone” prevents or treats a broad range of chronic diseases.

Recent systematic reviews show promising findings in several areas, but differences in devices, stimulation parameters, study populations, and outcome measures mean more rigorous research is needed.

Vagus Nerve Health: The Bigger Picture

The vagus nerve truly is remarkable.

It provides an important communication pathway between the brain and body and participates in regulating digestion, cardiovascular function, respiratory physiology, and neuroimmune communication.

But we do not need to exaggerate its role to appreciate its importance.

Vagus nerve health is not about finding one exercise that “resets” your nervous system or trying to maximize a single HRV score.

It is better understood as part of a much larger picture of autonomic regulation—how effectively our bodies adapt to changing demands and transition between activity, stress, rest, digestion, social engagement, and recovery.

Slow breathing, movement, restorative sleep, nourishing food, meaningful relationships, laughter, and time in nature may all contribute to this broader foundation of health.

Sometimes supporting the nervous system is less about doing something to the vagus nerve and more about creating the conditions that allow the entire system to function well.

I believe strongly in making space for these small but meaningful moments in everyday life. One of my favorite ways to do this is spending time outdoors—whether enjoying a quiet picnic, walking in nature, sharing a meal, or simply slowing down with people I love.

Those moments may not “reset” the vagus nerve.

But they can certainly be good for us.

This article draws in part on my doctoral research paper, Demystifying the Vagus Nerve: Auricular Acupuncture and Other Viable Interventions, completed as part of my Doctorate in Acupuncture and Chinese Medicine at Pacific College of Health and Science.

References

• Arneth, B.M. (2018) ‘Gut–brain axis biochemical signaling from the gastrointestinal tract to the central nervous system: Gut dysbiosis and altered brain function’, Postgraduate Medical Journal, 94(1114), pp. 446–452.
• Bellinger, D.L. and Lorton, D. (2018) ‘Sympathetic nerve hyperactivity in the spleen: Causal for nonpathogenic-driven chronic immune-mediated inflammatory diseases (IMIDs)?’, International Journal of Molecular Sciences, 19(4), p. 1188.
• Bertrand, D., Lee, C.H., Flood, D., Marger, F. and Donnelly-Roberts, D. (2015) ‘Therapeutic potential of α7 nicotinic acetylcholine receptors’, Pharmacological Reviews, 67(4), pp. 1025–1073.
• Bonaz, B., Sinniger, V. and Pellissier, S. (2016) ‘Anti-inflammatory properties of the vagus nerve: Potential therapeutic implications of vagus nerve stimulation’, The Journal of Physiology, 594(20), pp. 5781–5790.
• Bravo, J.A., Julio-Pieper, M., Forsythe, P., Kunze, W., Dinan, T.G., Bienenstock, J. and Cryan, J.F. (2012) ‘Communication between gastrointestinal bacteria and the nervous system’, Current Opinion in Pharmacology, 12(6), pp. 667–672.
• Breit, S., Kupferberg, A., Rogler, G. and Hasler, G. (2018) ‘Vagus nerve as modulator of the brain–gut axis in psychiatric and inflammatory disorders’, Frontiers in Psychiatry, 9, p. 44.
• Bremner, J.D., Gurel, N.Z., Wittbrodt, M.T., Shandhi, M.H., Rapaport, M.H., Nye, J.A., Pearce, B.D., Vaccarino, V., Shah, A.J., Park, J., Bikson, M. and Inan, O.T. (2020) ‘Application of noninvasive vagal nerve stimulation to stress-related psychiatric disorders’, Journal of Personalized Medicine, 10(3), p. 119.
• De Couck, M., Mravec, B. and Gidron, Y. (2012) ‘You may need the vagus nerve to understand pathophysiology and to treat diseases’, Clinical Science, 122(7), pp. 323–328.
• Frokjaer, J.B., Bergmann, S., Brock, C., Madzak, A., Farmer, A.D., Ellrich, J. and Drewes, A.M. (2016) ‘Modulation of vagal tone enhances gastroduodenal motility and reduces somatic pain sensitivity’, Neurogastroenterology & Motility, 28(4), pp. 592–598.
• Park, J.Y. and Namgung, U. (2018) ‘Electroacupuncture therapy in inflammation regulation: Current perspectives’, Journal of Inflammation Research, 11, pp. 227–237.
• Tan, C., Qiao, M., Ma, Y., Luo, Y., Fang, J. and Yang, Y. (2023) ‘The efficacy and safety of transcutaneous auricular vagus nerve stimulation in the treatment of depressive disorder: A systematic review and meta-analysis of randomized controlled trials’, Journal of Affective Disorders, 337, pp. 37–49.
• Veldman, F., Hawinkels, K. and Keszthelyi, D. (2025) ‘Efficacy of vagus nerve stimulation in gastrointestinal disorders: A systematic review’, Gastroenterology Report, 13, goaf009.
• Wu, C., Liu, P., Fu, H., Chen, W., Cui, S., Lu, L. and Tang, C. (2018) ‘Transcutaneous auricular vagus nerve stimulation in treating major depressive disorder: A systematic review and meta-analysis’, Medicine, 97(52), e13845.